I don't forget that Oblation exists but considering all tank busters are magical in this savage tier...
I pop a 20% or 30% Cooldown, put on TBN and Dark mind most of them.

Which mean we have a 30% + 20%, around 44% reduction with a 25% HP shield.
If I were to add oblation on top of it... Due to the way mitigation is calculated, it would be a whooping 6% reduction. Am I right?

If you get KO by 6% the problem definitely lies elsewhere. Ironically, it's because Dark Mind is useful that Oblation is that bad.